﻿E. 
  F. 
  TOMES 
  ON" 
  LOWEE-OOLITE 
  MADEEPOEAEIA. 
  427 
  

  

  costse 
  are 
  equal 
  and 
  of 
  about 
  the 
  same 
  thickness 
  as 
  the 
  septa 
  ; 
  and 
  the 
  

   spaces 
  between 
  them 
  are 
  a 
  little 
  wider 
  than 
  the 
  costse 
  themselves. 
  

  

  The 
  series 
  of 
  calices 
  are 
  generally 
  straight, 
  and 
  the 
  greatest 
  number 
  

   in 
  one 
  series 
  is 
  three. 
  The 
  walls 
  are 
  rather 
  prominent, 
  but 
  are 
  

   completely 
  hidden 
  by 
  the 
  septa, 
  which 
  come 
  into 
  contact 
  with 
  those 
  of 
  

   adjoining 
  calices 
  on 
  their 
  summits. 
  The 
  calices 
  are 
  shallow, 
  but 
  very 
  

   well 
  denned, 
  the 
  single 
  ones 
  being 
  saucer-shaped 
  and 
  having 
  no 
  fossula. 
  

   In 
  some 
  of 
  them 
  the 
  bottom 
  is 
  nearly 
  flat 
  and 
  of 
  nearly 
  the 
  full 
  

   breadth 
  of 
  the 
  calice. 
  

  

  The 
  septa 
  are 
  nowhere 
  exsert, 
  their 
  upper 
  margin 
  forming 
  a 
  gentle 
  

   concave 
  line 
  which, 
  when 
  unworn, 
  has 
  about 
  ten 
  well-formed 
  papiUse 
  ; 
  

   when 
  these 
  are 
  worn 
  off, 
  the 
  septa 
  have 
  a 
  very 
  uniform 
  and 
  smooth 
  

   appearance. 
  There 
  are 
  three 
  cycles, 
  and 
  part 
  of 
  a 
  fourth. 
  The 
  

   septa 
  of 
  the 
  first 
  and 
  second 
  cycles 
  are 
  of 
  equal 
  thickness 
  throughout, 
  

   and 
  meet 
  and 
  blend 
  in 
  the 
  centre 
  of 
  the 
  calice, 
  but 
  without 
  forming 
  

   a 
  false 
  columella 
  ; 
  those 
  of 
  the 
  third 
  cycle 
  are 
  three 
  fourths 
  of 
  the 
  

   length 
  of 
  those 
  of 
  the 
  first 
  and 
  second 
  ; 
  and 
  those 
  of 
  the 
  fourth 
  vary 
  

   according 
  to 
  their 
  degree 
  of 
  development, 
  but 
  in 
  some 
  of 
  the 
  systems 
  

   they 
  are 
  about 
  half 
  the 
  length 
  of 
  those 
  of 
  the 
  first 
  and 
  second 
  cycles. 
  

  

  The 
  dissepiments 
  are 
  abundant. 
  

  

  The 
  diameter 
  of 
  the 
  furrows 
  is 
  about 
  2 
  lines 
  The 
  height 
  of 
  the 
  

   corallum 
  is 
  1-|- 
  inch, 
  and 
  its 
  diameter 
  2-1- 
  inches. 
  

  

  I 
  have 
  only 
  met 
  with 
  one 
  specimen 
  of 
  this 
  species 
  ; 
  and 
  it 
  was 
  

   obtained 
  from 
  the 
  oolite 
  marl 
  at 
  Sheepscombe, 
  by 
  Mr. 
  W. 
  Jenkins 
  

   of 
  Cheltenham. 
  

  

  There 
  is 
  no 
  difficulty 
  in 
  distinguishing 
  this 
  species 
  from 
  the 
  other 
  

   English 
  ones. 
  The 
  shape 
  of 
  the 
  calices, 
  the 
  uniformity 
  in 
  the 
  thickness 
  

   of 
  the 
  septa, 
  and 
  their 
  union 
  with 
  each 
  other 
  in 
  the 
  centre 
  of 
  the 
  

   calice 
  will 
  easily 
  distinguish 
  it 
  from 
  L. 
  Davidsoni 
  ; 
  and 
  with 
  the 
  

   large-caliced 
  L. 
  Flemengi 
  it 
  cannot 
  for 
  a 
  moment 
  be 
  confounded. 
  

   Moreover 
  the 
  septa 
  of 
  the 
  latter 
  species 
  often 
  anastomose, 
  which 
  they 
  

   never 
  do 
  in 
  the 
  present 
  species. 
  

  

  Latem^andea 
  tabtjlata, 
  n. 
  sp. 
  

  

  The 
  corallum 
  is 
  massive, 
  and 
  the 
  corallites, 
  though 
  well 
  defined 
  and 
  

   appearing 
  in 
  has 
  relief 
  on 
  the 
  lower 
  and 
  outer 
  parts 
  of 
  the 
  corallum, 
  

   are 
  attached 
  to 
  each 
  other 
  and 
  have 
  a 
  common 
  epitheca. 
  

  

  In 
  shape 
  the 
  corallum 
  is 
  subcylindrical, 
  and 
  as 
  high 
  as 
  wide. 
  It 
  

   is 
  attached 
  by 
  a 
  small 
  base, 
  from 
  which 
  the 
  corallites 
  spring 
  and 
  

   radiate 
  almost 
  horizontally 
  until 
  they 
  have 
  formed 
  the 
  base 
  of 
  the 
  coral- 
  

   lum 
  of 
  the 
  full 
  diameter 
  to 
  which 
  the 
  corallum 
  attains. 
  Then 
  another 
  

   tier 
  is 
  placed 
  upon 
  them, 
  and 
  so 
  on 
  until 
  the 
  height 
  of 
  the 
  corallum 
  

   is 
  attained. 
  The 
  exposed 
  or 
  outer 
  boundary 
  of 
  these 
  tiers 
  of 
  coral- 
  

   lites 
  consists 
  of 
  calices 
  which 
  are 
  sometimes 
  surrounded 
  by 
  a 
  narrow 
  

   ring 
  of 
  epitheca, 
  though 
  more 
  frequently 
  a 
  bundle 
  instead 
  of 
  a 
  single 
  

   one 
  is 
  so 
  surrounded. 
  

  

  Each 
  corallite 
  has 
  rather 
  numerous 
  accretion-ridges; 
  and 
  there 
  is 
  

   an 
  increase 
  in 
  their 
  diameter 
  at 
  these 
  points. 
  

  

  The 
  epitheca 
  is 
  well 
  developed, 
  and 
  presents 
  numerous 
  rings 
  and 
  

   folds. 
  

  

  2g2 
  

  

  